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authorClemens Ladisch <clemens@ladisch.de>2012-04-11 17:39:19 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2012-04-17 22:57:02 +0200
commit94fba9fbeac44462c498e848496ba088198d78d1 (patch)
tree6c161b9133f55949570b742dff29ce102c9d2ccb /drivers/firewire
parent3b00b008888a851499bc039e70d12002af00ec9c (diff)
downloadlinaro-lsk-94fba9fbeac44462c498e848496ba088198d78d1.tar.gz
firewire: core: log config rom reading errors
If reading or refreshing a config rom fails, also log the actual error that caused it to fail. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/core-device.c42
1 files changed, 27 insertions, 15 deletions
diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index f9f782afedf..a3f486fbd7b 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -481,6 +481,7 @@ static int read_rom(struct fw_device *device,
* generation changes under us, read_config_rom will fail and get retried.
* It's better to start all over in this case because the node from which we
* are reading the ROM may have changed the ROM during the reset.
+ * Returns either a result code or a negative error code.
*/
static int read_config_rom(struct fw_device *device, int generation)
{
@@ -488,7 +489,7 @@ static int read_config_rom(struct fw_device *device, int generation)
const u32 *old_rom, *new_rom;
u32 *rom, *stack;
u32 sp, key;
- int i, end, length, ret = -1;
+ int i, end, length, ret;
rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
@@ -502,7 +503,8 @@ static int read_config_rom(struct fw_device *device, int generation)
/* First read the bus info block. */
for (i = 0; i < 5; i++) {
- if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
+ ret = read_rom(device, generation, i, &rom[i]);
+ if (ret != RCODE_COMPLETE)
goto out;
/*
* As per IEEE1212 7.2, during initialization, devices can
@@ -512,8 +514,10 @@ static int read_config_rom(struct fw_device *device, int generation)
* harddisk). In that case we just fail, and the
* retry mechanism will try again later.
*/
- if (i == 0 && rom[i] == 0)
+ if (i == 0 && rom[i] == 0) {
+ ret = RCODE_BUSY;
goto out;
+ }
}
device->max_speed = device->node->max_speed;
@@ -563,11 +567,14 @@ static int read_config_rom(struct fw_device *device, int generation)
*/
key = stack[--sp];
i = key & 0xffffff;
- if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE))
+ if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) {
+ ret = -ENXIO;
goto out;
+ }
/* Read header quadlet for the block to get the length. */
- if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
+ ret = read_rom(device, generation, i, &rom[i]);
+ if (ret != RCODE_COMPLETE)
goto out;
end = i + (rom[i] >> 16) + 1;
if (end > MAX_CONFIG_ROM_SIZE) {
@@ -590,8 +597,8 @@ static int read_config_rom(struct fw_device *device, int generation)
* it references another block, and push it in that case.
*/
for (; i < end; i++) {
- if (read_rom(device, generation, i, &rom[i]) !=
- RCODE_COMPLETE)
+ ret = read_rom(device, generation, i, &rom[i]);
+ if (ret != RCODE_COMPLETE)
goto out;
if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
@@ -619,8 +626,10 @@ static int read_config_rom(struct fw_device *device, int generation)
old_rom = device->config_rom;
new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
- if (new_rom == NULL)
+ if (new_rom == NULL) {
+ ret = -ENOMEM;
goto out;
+ }
down_write(&fw_device_rwsem);
device->config_rom = new_rom;
@@ -628,7 +637,7 @@ static int read_config_rom(struct fw_device *device, int generation)
up_write(&fw_device_rwsem);
kfree(old_rom);
- ret = 0;
+ ret = RCODE_COMPLETE;
device->max_rec = rom[2] >> 12 & 0xf;
device->cmc = rom[2] >> 30 & 1;
device->irmc = rom[2] >> 31 & 1;
@@ -967,15 +976,17 @@ static void fw_device_init(struct work_struct *work)
* device.
*/
- if (read_config_rom(device, device->generation) < 0) {
+ ret = read_config_rom(device, device->generation);
+ if (ret != RCODE_COMPLETE) {
if (device->config_rom_retries < MAX_RETRIES &&
atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
device->config_rom_retries++;
fw_schedule_device_work(device, RETRY_DELAY);
} else {
if (device->node->link_on)
- fw_notice(card, "giving up on Config ROM for node id %x\n",
- device->node_id);
+ fw_notice(card, "giving up on node %x: reading config rom failed: %s\n",
+ device->node_id,
+ fw_rcode_string(ret));
if (device->node == card->root_node)
fw_schedule_bm_work(card, 0);
fw_device_release(&device->device);
@@ -1132,7 +1143,8 @@ static void fw_device_refresh(struct work_struct *work)
*/
device_for_each_child(&device->device, NULL, shutdown_unit);
- if (read_config_rom(device, device->generation) < 0) {
+ ret = read_config_rom(device, device->generation);
+ if (ret != RCODE_COMPLETE) {
if (device->config_rom_retries < MAX_RETRIES &&
atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
device->config_rom_retries++;
@@ -1159,8 +1171,8 @@ static void fw_device_refresh(struct work_struct *work)
goto out;
give_up:
- fw_notice(card, "giving up on refresh of device %s\n",
- dev_name(&device->device));
+ fw_notice(card, "giving up on refresh of device %s: %s\n",
+ dev_name(&device->device), fw_rcode_string(ret));
gone:
atomic_set(&device->state, FW_DEVICE_GONE);
PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);